THE LIZARDS OF THE GENUS TACHYDROMUS. 



231 



subocular, which is as broad beneath as above. Temporal scales very small, 

 hexagonal, keeled; two large upper temporals, keeled above, first not in contact with 

 the fourth supraocular ; a long and narrow tympanic shield. 



4 pairs of chin-shields, the 3 anterior in contact in the middle ; 26 gular scales 

 in the median line, anterior narrow, juxtaposed, smooth, posterior increasing in size, 

 imbricate, pointed, strongly keeled, and passing gradually into the ventral plates, 

 there being no trace of a collar. 



Dorsal plates truncate and shortly mucronate behind, in 6 longitudinal series on 

 the neck and body. Ventral plates truncate and shortly mucronate, strongly keeled, 

 in 10 longitudinal and 30 transverse series ; no large scales bordering the ventral 

 plates. 32 plates and scales round the middle of the body. Prseanal plate large, 

 bicarinate, with smaller keeled plates on the sides. 



Upper surface of limbs with rhombic keeled scales. A single femoral pore on 

 each side. 1 Subdigital lamellae single, 22 under the fourth toe. 



Caudal scales strongly keeled and shortly mucronate, the keels forming 6 ridges 

 on the upper surface of the basal part of the tail ; the whorls nearly equal in length, 

 the fourth containing 18 scales. 



Reddish brown above, with a broad whitish streak on each side, proceeding 

 from the superciliary edge ; below this a dark brown lateral streak, proceeding from 

 the nostril and passing through the eye and the tympanum ; limbs reddish. Lower 

 parts yellowish white. 



Measurements, in millimetres. 



From end of snout to vent 



„ „ „ ., ., fore limb 

 Head 



Wdith of head 

 Depth of head 

 Fore limb 

 Hind limb 

 Foot 

 Tail 



60 



23 



14 



6 



5 

 25 

 30 

 16 



145 



This species is known from a single male specimen, from Goalpara in Assam, 

 preserved in the Indian Museum, Calcutta, which has been kindly entrusted to me 

 for description by Dr. Annandale. 



It is closely allied to T. sexlineatus , but differs in the still narrower head, the 

 shorter tail, the number of series of dorsal plates, the smaller temporal scales, and 

 the total absence of a collar. 



Platyplacopus, g. n. 

 Head-shields normal. Nostril pierced between the nasal, one or two postnasals, 

 and the first upper labial. Lower eyelid scaly. Collar distinct. Back with large, 

 plate-like, imbricate scales with strong keels forming continuous lines; sides with 



1 Gunther's statement that there are 2 pores is due to a misunderstanding of Anderson's description, which men- 

 tions " one pair of femoral pores." # 



